I am using NetBrain ITE and try to map my
network, and after a long period the mapping dialog went away and left
it such that when I clicked on map a network again, it showed me a map
of a totally fictitious network. No actual devices on my net were
shown at all.

One is using our Instant Trial via which you can try all the feature of NetBrain on our lab instead of your own network. After registering an Instant Trial account you can login to trial.netbraintech.com or class.netbraintech.com or ccie.netbraintech.com from our NetBrain ITE workstation.

The other is our Advance trial. If you want to evaluate a full deployment of NetBrain on your own network, you need to register a advanced trial on http://info.netbraintech.com/14-day-trial-request.html.